Should expose a method to just compile Flux

I would like to have an endpoint to validate that some Flux is, at least, syntactically correct.

This would be great for users, because your go module shouldn't depend on Flux to validate a script, and you shouldn't care about versioning, but just request to your InfluxDB server 👍

Start by reviewing the Go client’s existing endpoint methods and how requests are sent to the InfluxDB server. Define the endpoint for validating Flux syntax without requiring the Go module to depend on Flux; done means callers can submit Flux to InfluxDB and receive validation results.

Written by the indexing model from the issue text.